in boston today, dzhokhar tsarnaev was charged with using and conspiring to use a weapon of mass destruction. the maximum penalty is death. many questions remain unanswered. were they acting alone or did they have help? were they planning more attacks and was their chechen ethnicity important? joining me now is david remnick, he is editor of the "new yorker" magazine which has a full coverage here called "the marathon bombing: tragedy in boston, a place in history" of george parker. "the culprits" by david remnick and the street scene by seth manukin. welcome. >> thank you. >> rose: here's what you say. "the sense of bland unknowingness, he seemed so nice began to evaporate the closer we got to the tsarnaev brothers." >> always in these tragedies, murder stories, terrorist stories, you have the initial quotes from -- "he seemed so quiet, he seemed so nice, i just saw him the other day." >>. >> rose: with his dog. >> and all that kind of stuff. but because of social media that evaporated quickly and you immediately started to get youtube pages for the older brother. you got a twitter feed fro